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== Estimating Groundwater Use==
== Estimating Groundwater Use==


Several attempts have been made at local, national and international scales in Africa to estimate how much groundwater is being used, how many people depend on groundwater, and the kinds of activities which groundwater supports. However, because groundwater use is so varied and dispersed, and because of problems collecting, recording, managing and accessing relevant information on groundwater use, these estimates are difficult, and can be unreliable. The most widely used source of information on groundwater use is the [https://www.fao.org/nr/water/aquastat/main/index.stm FAO AQUASTAT] website. Other estimates have been done, for example of groundwater used for irrigation (Seibert et al., 2010), and groundwater use for drinking water from the WHO/UNICEF Joint Monitoring Programme.
Several attempts have been made at local, national and international scales in Africa to estimate how much groundwater is being used, how many people depend on groundwater, and the kinds of activities which groundwater supports. However, because groundwater use is so varied and dispersed, and because of problems collecting, recording, managing and accessing relevant information on groundwater use, these estimates are difficult, and can be unreliable. The most widely used source of information on groundwater use is the [https://www.fao.org/nr/water/aquastat/main/index.stm FAO AQUASTAT] website. Other estimates have been done, for example of groundwater used for irrigation (Seibert et al., 2010), and groundwater use for drinking water from the WHO/UNICEF Joint Monitoring Programme. Another method relies on the fact that so much of the rural population of Africa depends on groundwater, so that the density of rural population can be a useful surrogate for groundwater use.




done in different ways, based on different information, and give different results. However, they are all useful towards increasing understanding of the role of groundwater in Africa and how it could be better developed and used in future. This page describes some ways of addressing the issue of groundwater use. It is not a comprehensive assessment; more information can be obtained by following the links to other organisations below.  
===[https://www.fao.org/nr/water/aquastat/main/index.stm  FAO AQUASTAT]===


This is is the FAO’s global water information system, providing data for countries in Africa, Asia, Latin America, and the Caribbean. Each country profile contains general information on the geographical and economic situation of the country, and more detailed information on water resources (major sources of surface water and groundwater), water use (with a particular focus on irrigation), and water management.
===WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation===
The [https://www.wssinfo.org/ WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation] is ongoing, and is providing summary statistics for water supply and sanitation coverage.


===African population data===
===African population data===
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===Citations and Links to Further Information===


Balk, D L, Deichmann, U, Yetman, G, Pozzi, F, Hay, S I, and Nelson, A. 2006. Determining Global Population Distribution: Methods, Applications and Data. Advances in Parasitology, Vol. 62, 119-156. (http://dx.doi.org/10.1016/S0065-308X(05)62004-0)
Balk, DL, Deichmann, U, Yetman, G, Pozzi, F, Hay, SI, and Nelson, A. 2006. [https://dx.doi.org/10.1016/S0065-308X(05)62004-0 Determining Global Population Distribution: Methods, Applications and Data]. Advances in Parasitology, Vol. 62, 119-156. doi:10.1016/S0065-308X(05)62004-0.


CIESEN, IFPRI, The World Bank and CIAT. 2011. Global Rural-Urban Mapping Projectm Version 1 (GRUMPv1): Urban Extents Grid. Palisades, NY: NASA Socioeconomic Data and Applications Centre. Accessed 30th October 2014.
CIESEN, IFPRI, The World Bank and CIAT. 2011. [https://sedac.ciesin.columbia.edu/data/collection/grump-v1 Global Rural-Urban Mapping Projectm Version 1 (GRUMPv1): Urban Extents Grid]. Palisades, NY: NASA Socioeconomic Data and Applications Centre (SEDAC). Accessed 30th October 2014.
 
Nelson, A. 2004. African Population Database, UNEP GRID Sioux Falls. Retrieved 29th October 2014 (see Links to other data, below).
 
Nelson, A. 2004. African Population Database Documentation, UNEP GRID Sioux Falls. Retrieved 29th October 2014 (see External links below).
 
 
 
 
==WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation==
 
The [https://www.wssinfo.org/ WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation] is ongoing, and is providing summary statistics for water supply and sanitation coverage.
 
== Links to other data ==
 
The UNEP/GRID Africa Population Distribution Database can be accessed via the [https://na.unep.net/siouxfalls/datasets/datalist.php UNEP website]
 
The GRUMP Urban Extents Grid can be accessed via [https://sedac.ciesin.columbia.edu/data/collection/grump-v1 NASA’s Socioeconomic Data and Applications Centre (SEDAC)]
 
===Citations and Further Information===


Seibert S, Burke J, Faures JM, Frenken K, Hoogeveen J, Doll P & Portmann FT. 2010. [https://www.fao.org/docrep/013/al816e/al816e00.pdf Groundwater use for irrigation - a global inventory]. Hydrol. Earth Syst. Sci. 14, 1863-1880. doi: 10.5194/hess-14-1863-2010
Seibert S, Burke J, Faures JM, Frenken K, Hoogeveen J, Doll P & Portmann FT. 2010. [https://www.fao.org/docrep/013/al816e/al816e00.pdf Groundwater use for irrigation - a global inventory]. Hydrol. Earth Syst. Sci. 14, 1863-1880. doi: 10.5194/hess-14-1863-2010


 
UNEP/GRID. 2004. [https://na.unep.net/siouxfalls/datasets/datalist.php African Population Distribution Database]. UNEP GRID Sioux Falls. Retrieved 29th October 2014.
[https://www.fao.org/nr/water/aquastat/main/index.stm  '''FAO AQUASTAT''']. This is is the FAO’s global water information system, providing data for countries in Africa, Asia, Latin America, and the Caribbean. Each country profile contains general information on the geographical and economic situation of the country, and more detailed information on water resources (major sources of surface water and groundwater), water use (with a particular focus on irrigation), and water management.  
 





Revision as of 16:19, 21 March 2016

Africa Groundwater Atlas >> Additional resources >> Groundwater Use

Estimating Groundwater Use

Several attempts have been made at local, national and international scales in Africa to estimate how much groundwater is being used, how many people depend on groundwater, and the kinds of activities which groundwater supports. However, because groundwater use is so varied and dispersed, and because of problems collecting, recording, managing and accessing relevant information on groundwater use, these estimates are difficult, and can be unreliable. The most widely used source of information on groundwater use is the FAO AQUASTAT website. Other estimates have been done, for example of groundwater used for irrigation (Seibert et al., 2010), and groundwater use for drinking water from the WHO/UNICEF Joint Monitoring Programme. Another method relies on the fact that so much of the rural population of Africa depends on groundwater, so that the density of rural population can be a useful surrogate for groundwater use.


FAO AQUASTAT

This is is the FAO’s global water information system, providing data for countries in Africa, Asia, Latin America, and the Caribbean. Each country profile contains general information on the geographical and economic situation of the country, and more detailed information on water resources (major sources of surface water and groundwater), water use (with a particular focus on irrigation), and water management.

WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation

The WHO/UNICEF Joint Monitoring Programme for Water Supply and Sanitation is ongoing, and is providing summary statistics for water supply and sanitation coverage.

African population data

An indication of groundwater use across Africa has been developed using rural and urban population data. Gridded datasets of population and urban extent across Africa were processed to provide an estimate of the number of people living on each main aquifer type, and what proportion of this population lives in rural and urban areas.

The gridded population data are derived from the United Nations Environment Programme/Global Resource Information Database (UNEP/GRID) Africa Population Distribution Database (4th edition). This dataset uses population data from 109 000 administrative units across Africa, the most recent of which were compiled for the year 2000. The regional data are gridded using an interpolation method based on settlement locations and transport infrastructure, which helps to distribute the population across an administrative area. The gridding approach and the key sources of uncertainty in the dataset are discussed in detail in the data documentation (Nelson, 2004).

The gridded rural-urban data (Balk et al., 2006) are derived from the Global Rural-Urban Mapping Project (GRUMP) Urban Extents Grid (v1). This dataset is produced by the Centre for International Earth Science Information Network (CIESIN) at Columbia University, the International Food Policy Research Institute (IFPRI), The World Bank, and the Centro Internacional de Agricultura Tropical (CIAT). The dataset is based on a combination of population counts, settlement points, and the presence of night-time lights as observed by a series of US Department of Defence meteorological satellites over several decades.


Citations and Links to Further Information

Balk, DL, Deichmann, U, Yetman, G, Pozzi, F, Hay, SI, and Nelson, A. 2006. Determining Global Population Distribution: Methods, Applications and Data. Advances in Parasitology, Vol. 62, 119-156. doi:10.1016/S0065-308X(05)62004-0.

CIESEN, IFPRI, The World Bank and CIAT. 2011. Global Rural-Urban Mapping Projectm Version 1 (GRUMPv1): Urban Extents Grid. Palisades, NY: NASA Socioeconomic Data and Applications Centre (SEDAC). Accessed 30th October 2014.

Seibert S, Burke J, Faures JM, Frenken K, Hoogeveen J, Doll P & Portmann FT. 2010. Groundwater use for irrigation - a global inventory. Hydrol. Earth Syst. Sci. 14, 1863-1880. doi: 10.5194/hess-14-1863-2010

UNEP/GRID. 2004. African Population Distribution Database. UNEP GRID Sioux Falls. Retrieved 29th October 2014.


Africa Groundwater Atlas >> Additional resources >> Groundwater Use